Typewriter having means to store characters selected during carriage movements



NOV. 21, 1967 YQUNG 3,353,646 TYPEWRITER HAVING MEANS TO STORE CH CTERSSELECTED DURING CARRIAGE MOVEME Filed Sept. 14, 1966 INVENTOR. I RICHARDJ. YOUNG ATTORNEY.

United States Patent 3,353 646 TYPEWRITER HAVING M EANS T0 STORE CHAR-ACTERS SELECTED DURING CARRIAGE MOVE- MENTS Richard J. Young, Lexington,Ky., assiguor to International Business Machines Corporation, Armonk,

N .Y., a corporation of New York Filed Sept. 14, 1966, Ser. No. 579,3058 Claims. (Cl. 197-16) ABSTRACT OF THE DISCLOSURE Disclosure of theinvention My invention provides mechanism for preventing undesiredprinting during the performance of a long func tion, usually ofindeterminate length (cg. line or carriage return, or tabulation) whilepermitting at least limited operation of character keys and without lossof information. More specifically, I provide means for storing characterprint information entered during the performance of a long functionuntil the function is complete. At that time, the stored information isallowed to cause a print output. For example, with my invention, atypist may strike a letter key during a line return operation, but theletter will not print until the beginning of the new line has beenreached.

Typing speed is related among other things, to considerations of rhythmand the pressure or concentration required to avoid errors. Efforts tospeed up and interlock various operations have been exerted over theyears with considerable beneficial effect. For example, a relativelyfast interlocked keyboard is disclosed in US. Patent 3,086,635 entitledKeylever Storage Mechanism, issued Apr. 23, 1963 to LB. Palmer. Also,mechanism for interlocking physically inconsistent functions, such as,character and case selection in a single element typewriter is disclosedin US. Patent 3,157,265 entitled Print Interlock for Typewriter, issuedNov. 17, 1964 to L. E. Palmer. Interlocks have also been known for longfunctions, such I as carriage return, as shown for example in US. Patent2,103,921 entitled Typewriting Machine, issued Dec. 28, 1937 to R. G.Thompson.

Carriage return interlocks such as that of US. Patent 2,103,921 haveprovided their error preventing function at the expense of rhythmconsiderations since the interlocking function was accomplished bypreventing key depression. It can be appreciated that a typist whomisjudges the completion of a carriage return and encounters aphysically blocked keybutton will be thrown off stride or will alreadybe depressing a second key before recognizing that the first key did notcause a print. An error would result due to missing the first selectedcharacter. Presently, these conditions are mentally compensated for bypositive effort on the typists part to avoid early typing. This solutionof itself detracts from typing speed.

Accordingly, an object of my invention has been to provide a simplemechanism for preventing undesired printing during long functions, suchas line return and tabulation, without interrupting the typists normalrhythm.

Another object of my invention has been to provide interlockingmechanism that extends the range of permissible typists timing errorrelative to termination of a long function, to avoid rhythm interruptionand reduce error pressure.

These objects are obtained in my invention through the use of acyclically operating character storing keyboard and printer, such asthat of the Selectric typewriter manufactured by International BusinessMachines Corporation, Armonk, New York, and fully described inInstruction Manual Form Part No. 2415032-2, published January 1966. Itis to be understood, however, that my invention is not limited to singleelement typewriters but is generally applicable to keyboard operatedprinters wherein character print operations are limited to sequentialrather than overlapping cyclic operation. Examples of typebartypewriters having sequential cycle operation are found in US. Patent2,489,826 entitled Power Mechanism for Typewriting Machines, issued Nov.29, 1949 to J. F. Smathers and aforesaid US. Patent 3,086,635.

In sequential cycle machines, some means is provided for initiatingacyclic operation under the control of, but time wise independent of keydepression. A new cycle can begin only after the previous cycle iscomplete. As it is impossible for key depression to occur at a rateexceeding the rate of sequential cycles, mechanism is provided to retainor store the information that a particular key was depressed and, at theproper sequential cyclic time, an appropriate print operation occurs.This operation may be considered as converting a time wise random entryor flurry of keyboard data into a time wise regular sequence of printoperations. While such a time wise regular sequence is a virtualnecessity for a single element typewriter, it is a useful feature fortypebar typewriters a it prevents typebar clashing, which is a majorcause of type misalignment.

By my invention, mechanism, is provided to recognize the continuedperformance of a long function which has been latched into operation,and to prevent initiation of any print cycle during such performance.Inasmuch as the keyboard employed has physically separated key entryfrom the print operation, information stored representative of adepressed key will simply be retained until the long function mechanismceases to operate or is unlatched.

An added advantage is provided by the addition of an interkey interlockthat prevents simultaneous storage of information from plural characterkeybuttons. Accordingly, in the preferred embodiment of my invention,one key can be depressed during a long function and its information willbe stored. A depression of a second key will be prevented however by theinterkey interlock. It will be appreciated that one benefit gained bypermitting a single character to be stored is the extension of theperiod of time for the typist to judge termination of a long functionand thereby increase typing speed by'reducing the possibility of rhythminterruption and of error. Another benefit is the positive start signalproduced for the operator by feeling the second key during line return.For example, a typist desiring to type the word I 3 during the remainderof the line return, the typist will feel the time to start typing the dand the remainder of the line by when the n key goes down.

These and other objects, features, and advantages of my invention willbe apparent to those skilled in the art upon reading and understandingthe following description of a specific preferred embodiment of myinvention wherein reference is made to the accompanying drawings, ofwhich:

The figure is a simplified perspective view of a typewriter showing theoperative components of my preferred embodiment.

More specifically the figure shows a typewriter or printer having aplaten 11 to provide paper holding means, a print element 12 cooperablewith the platen 11 to provide printing means, a carrier 13 forsupporting the print element 12 for lateral displacement relative to theplaten 11, and a keyboard for providing operator control of printing anddisplacement of the print element 12. Details of a typewriter of thistype are more completely disclosed in the aforesaid Instruction Manual.

The keyboard 20 includes character keys of which keys 21 and 22 aretypical, and long function keys such as a line or carrier return key 23and a tabulation key 24. The character keys 21 and 22 are associatedwith individual code selecting interposers or transfer links 25 whichprovide the means for conveying character selection information from adepressed character key to the print element 12 through schematicallyshown selection and print drive mechanism 30. The interposers 25 arenormally retained leftwardly of storage latch springs 25a against thebias of individual coil springs 25b, and out of operative range of arotatable filter shaft 26. This normal position of the interposer 25 isidentified as its inactive state or condition.

Depression of a key such as 22, moves its associated interposer 25downwardly by force transmitted through non-repeat connection 27 thusreleasing the interposer from its latch spring 25a and allowing theinterposer to move rightwardly under the influence of coil spring 25b.Latch spring 25a now serves to retain the thus displaced interposer 25is a rightward and downward position where it is operatively alignedwith the filter shaft 26 to be driven rearwardly thereby upon itsrotation. This latched down position of the interposer 25 is identifiedas its storage state or condition.

Rotation of the filter shaft 26 and power driving of the selection andprint drive mechanism 30 is accomplished through a cyclically operableprint power control device such as a spring clutch 40. Cycle initiationof clutch is controlled by a self restoring stop latch 41 having anoperating link 42 and a control latch 43. The operating link 42 isnormally held in an inactive position, as shown, against the bias of acoil spring 44 by engagement between the control latch 43 and stationaryframe 14. A bail or universal bar 28 transmits the downward position ofany interposer 25 in its stored condition to the control latch 43 thuspermitting spring 44 to pull stop latch 41 to an active position out ofengagement with the cycle clutch 40, thereby initiating a cycle ofoperation. The cycle of operation causes various functions throughmechanism known in the art and shown only schematically, includingrotation of the filter shaft 26, impact driving of the type element 12and letter feed escapement of the carrier 13. As the filter shaft 26rotates, it drives the previously displaced interposer 25 leftwardly tocause print selection by bails 25c and restores the interposer to itsinactive state all as more completely described in aforesaid Patent3,086,635. The condition of the interposer 25 while in leftward orcharacter selection controlling motion, is identified as its controlstate or condition.

An interkey ball interlock 29 is provided to prevent the simultaneouspresence of two interposers 25 in the storage state which would cause anerroneous character selection. The ball interlock 29 is constructedhowever, to permit one interposer 25 to be in the control state and asecond interposer 25 to be placed in the storage state. By this means, arandom flurry of key operations can be reconciled with a regularsequential cyclic print output.

Displacement of the carrier 13 along its supporting rail 15 relative tothe platen 11 is accomplished through energy supplied by a cord 51 thatis guided in a closed loop by pulleys 52 to a power capstan 53. The cord51 is driven in one direction by a spiral main spring 54 for forward orleft to right movement, and by a motor 55 in the reverse direction. Themotor 55 also serves to wind the spring 54 and provide the rotationalenergy controlled by the cycle clutch 40. The letter feed escapementcontrol itself forms no part of this invention and reference may be hadto pages 39 through 42 particularly of the aforesaid Instruction Manualfor details thereof.

Return of the carrier 13 to a new line is controlled by key 23 whichoperates an appropriate print position 10- cating, line or carriagereturn mechanism generally indicated at 60, details of which form nopart of this invention. Suitable carriage return mechanisms are shown inUS. Patent 2,902,133 entitled Typewriter Carriage Return and IndexingMechanism, issued Sept. 1, 1959, to N. D. Walton and H. R. Kruspe, andalso, on pages 52 through 55 of the aforesaid manual. The significantportion of the mechanism pertinent to this invention involves a twoposition shaft or line return control member 61 that controls continuedoperation of the line return mechanism throughout its random length ofoperation. Shaft 61 is rotated counterclockwise by a mechanism thatinitiates the line return operation in response to key depression and isretained by latch arm 62 and latch link 63 in the operative or linereturn on position until a margin stop 64 engages a counterstop 65indicating that the left margin or new line position has been reached.Counterstop 65 drives the :margin stop 64 and margin rack 66 leftwardlyagainst a coil spring 67 to rotate a bell crank 68 counterclockwisepivoting latch link 63 counterclockwise and releasing the line returncontrol arm 62 to return to the line return off condition. It should benoted that proper line return operation involves not only driving of thecarrier 13 but also appropriate control of the normal letter feedmechanism, backspace mechanism and index or line feed mechanism.However, as such control is known in the art and forms no part of thisinvention, it is not specifically disclosed herein.

Tabulation or random length forward continued movement of the carrier 13is accomplished as known in the art simply by freeing the carrier 13from its normal letter feed control (not shown) and permitting mainspring 54 to pull the carrier to the right until a preset tab stop 71 isencountered by a sensing finger 72, at which time the normal letter feedescapement is placed back in control of the carrier 13. As control overthe letter feed mechanism to accomplish tabulation forms no part of thisinvention, specific description thereof, is unnecessary. Reference maybe had however to pages 59 through 64 of the aforesaid instructionmanual for appropriate details.

Of principal importance in the forward print position, locating ortabulation mechanism is the control lever or member 73 which senses anddetermines the continued operation of the tabulating mechanism. Thetabulation control lever 73 is shown in its normal position pivotallyand slidably mounted on a carrier mounted pivot stud 74 where it isretained by a coil spring 75. A control torque bar 76 engages a controlfinger 73a and feedback finger 73b of the control lever 73 to provide amechanical connection between the moving carrier 13 and the stationaryoperating mechanisms of the typewriter. It can be seen that clockwisepivoting of the torque bar 76 against control finger 73a drives thecontrol lever 73 clockwise about pivot stud 74 permitting a latch link77 to fall behind its outer end. The lever 73 is thus stored in itsprojected or active position. In this position, the escapement mechanism(not shown) is manipulated to permit tabulation motion of the carrier13.

Feedback finger 73b engages the torque bar 76 and retains it in theclockwise position so long as the control lever is latched by link 77into active position. When the carrier 13 reaches the desired lateralposition the sensing finger 72 strikes a preset tab stop 71, and controllever 73 is driven leftwardly against spring 75, beyond the effectivereach of latch link 77. Spring 75 thus restores the control lever 73counterclockwise to its original inactive position. In this position,the control of the carrier 13 is restored to the escapement mechanism(not shown). Initial operation of the tabulation mechanism is controlledby key 24 which can operate through suitable mechanism such as a powerdevice or simply linkage 78, to rotate or pivot the torque bar 76 aspreviously described.

From the foregoing description of the line return and tabulationmechanism, it will be observed that a common structural feature existsin the provision of latching means that maintain a controlling elementoperative until the associated function has been terminated. In eachcase, a member 61 and 73 is provided having a position representative ofcontinued operation of the function. This member is employed to providethe intelligence for my invention.

In the lower central portion of the figure, there is shown aninterrupter finger or stop member 80 that is mounted for pivotalmovement on a shaft 81 and normally biased by an upwardly inclinedspring 82 to a position of noninterference with the clutch operatinglink 42. The interrupter 80 is rotatable against spring 82 to a positionwherein it intercepts a shoulder or edge surface 45 of the operationlink 42 in its leftward motion by spring 44. The clutch latch 41 is thusinhibited from its normal response to movement of bail 82.

Shaft 81 includes an upwardly projecting crank portion 83 to which isattached both a control link 69 that moves leftward in response to theactive position of line return control member 61 taken from latch arm62, and a control link 79 which moves leftward in response to the activeposition of the tabulation control member 73 acting through the torquebar 76. The control links 69 and 79 are connected permissively to thecrank portion 83 by slot-ted brackets 84 such that movement of eithercontrol link leftwardly rotates the shaft 81 counterclockwise withoutinterference with the other control link.

It can be seen that upon initiation of a long function, as by depressionof either key 23 or key 24, an associated control member, for exampleline return control shaft 61, will be moved to a function controllingposition causing normal initiation and performance of the function. Theinitiation of the function is transmitted through control link 69 torotate the shaft 81 counterclockwise and bring interrupter finger 80into alignment with the surface 45 on clutch latch operating link 42.The line return latch arm 62 is retained by latch lever 63 in the activeposition during the continuance of the function such that theinterrupter finger 80 is also retained in an active position. If acharacter key such as 22 is depressed, its associated interposer 25 willbe stored under leaf spring 25a, the ball interlock 29 will beactivated, and the cycle clutch bail 28 will activate the control latch43 of the operating link 42 to free it from the frame part 14 and permitthe link 42 to move rearwardly by spring 44. Full movemen of the link 42will not be permitted, however, due to the presence of interrupterfinger 80 in the path of surface 45. Since the cycle clutch 40 is notunlatched, the filter shaft 26 does not rotate and the interposer 25 isretained in the ball interlock 29. Attempt to depress a second key suchas 21 is resisted by the ball interlock 29 and accordingly, further keyscannot be depressed until the print cycle for the first character keyhas been initiated. As the carrier 13 reaches the left hand margin ornew line position, counterstop 65 engages margin stop 64 and throughbell crank 68 latch link 63 is pivoted to release latch arm 62 and shaft61 thereby terminating the line return operation. Control link 69 ispulled to the right to permit interrupter to move out of the path ofsurface 45 and permit the complete operation of stop latch 41 toinitiate a print cycle for depressed key 22.

It should be noted that timing considerations are involved, as a matterof design, between the time the line return mechanism is unlatched andthe carrier settles at the margin, and the time required for print tooccur after release of the interrupter 80, to assure printing at themargin.

Similarly, tabulation is initiated by the depression of key 24, whencontrol lever 73 is moved to and stored in its projected or activeposition by clockwise pivoting of torque bar 76. Feedback finger 73b ofcontrol lever 73 maintains the torque bar 76 in its pivoted position andthrough control link 79 pivots shaft 81 and moves interrupter 80 intoalignment with surface 45. Subsequent depression of a character key isstored as previously explained. Termination of the tabulation restorestorque bar 76 to its counterclockwise position and permits theinterrupter finger 80 to move out of the path of surface 45.

It is possible that a line return or tabulation operation could beinitiated prior to full restoration of the operating link 42 from aprevious print cycle. To prevent part breakage and promote smoothoperation I have provided a floating or yieldable mount or support forthe shaft 81 in the form arcuate slot 85. In the event that interrupter80 strikes the bottom of the unrestored or active operating link 42, thepoint of contact therebetween will act as a center and the overload willcause the shaft 81 to move bodily in slot stretching spring 82. Whenoperating link 42 is fully restored, a path will be clear for theinterrupter 80 to move by spring 82 into its active position.

It will be appreciated by those skilled in the art that I have describeda particular preferred embodiment of a more general invention by whichtyping operations can be prevented at undesired times during theperformance of long functions usually of indeterminate or random length.The principle thrust of my invention lies in its ability to lessen thecriticality of the typists judgment as to when a long function has beenterminated and thereby increase typing speed and efliciency by reducingerror pressure without introducing a rhythm interference. It will thusbe understood that various modifications, deletions, and additions canbe made to my invention without departing from the novel conceptsthereof. In particular, it will be recognized that my invention is notlimited to single element typewriters but is equally applicable to anysequential cycle keyboard printer.

Having thus described my invention and a preferred illustrativeembodiment thereof, I claim:

1. A typewriter having a keyboard, a platen, printing means cooperabletherewith under the control of said keyboard, and means supporting saidplaten and said printing means for relative movement along a writingline, the improved control mechanism comprising:

a transfer link individually associated with each character key of saidkeyboard, each of said transfer links having a normal inactivecondition, a stored condition, and a control condition, each of saidtransfer links when in its control condition being operative to effectprinting of an associated character;

a cyclically operable print power control device for effecting printoperation in conjunction with said transfer links;

means normally operable upon the existence of any transfer link being inits stored condition for initiating a cycle of operation of said printpower control device;

means operated by said print power control device for placing storedtransfer links into their control condition;

a line return mechanism operatively connected to one of said printingmeans and said platen for causing relative movement thereof from anadvanced line position to a new line position, said line returnmechanism comprising a control member having a normal inactive positionand an active position indicative of line return operation;

a latch operatively associated with said control member for retainingsaid control member in its active position when independently movedthereto;

means responsive to the attainment of a new line position by saidprinting means and said platen for moving said latch to unlatch saidcontrol member; and

ancillary means cooperative with said cycle initiating means forpreventing cycle initiation thereby that any time said carriage returncontrol member is in its active position.

2. A typewriter as defined in claim 1 wherein:

said cycle initiating means comprises a movable operating link having anactive condition and an inactive condition;

said ancillary means comprises a finger movable to a position ofcooperation with said operating link when in its inactive condition tolimit movement thereof; and

further comprising means yieldably supporting said finger to permitoverload movement thereof Whenever it is moved at a time when saidoperating link is in its active condition.

3. A typewriter as defined in claim 1 wherein:

said cycle initiating means comprises a movable operating link havingactive condition and an inactive condition;

said ancillary means comprises a finger movable to a position ofcooperation with said operating link when in its inactive condition tolimit movement thereof; and

further comprising means yieldably supporting said finger to permitoverload movement thereof whenever it is moved at a time when saidoperating link is in its active condition.

4. A typewriter defined in claim 1' further comprising an interkeyinterlock operatively associated with all of said transfer links forpreventing the multiple presence of transfer links in said storagestate.

5. A typewriter as defined in claim 4 further comprising:

a tabulation mechanism operatively connected to said printing means andsaid platen for causing relative movement thereof to an advanced lineposition, said tabulation mechanism comprising a tabulation controlmember having normal inactive position and an active position indicativeof continued tabulation operation;

a tabulation latch operatively associated with said tabulation controlmember for retaining said tabulation control member in its activeposition when independently moved thereto;

means responsive to the attainment of a predetermined advanced lineposition by said printing means and said platen for moving saidtabulation latch to unlatch said tabulation control member;

and means connecting said tabulation mechanism with said ancillary meansto further prevent cycle initiation at any time said tabulation controlmember is in its active position.

6. A typewriter having a keyboard, a platen, printing means cooperabletherewith under the control of said keyboard, and means supporting saidplaten and said printing means for relative movement along a writingline, the improved control mechanism comprising:

a transfer link individually associated with each character key of saidkeyboard, each of said transfer links having a normal inactivecondition, a stored condition, and a control condition, each of saidtransfer 8 links when in its control condition being operative to effectprinting of an associated character;

a cyclically operable print power control device for effecting printingoperations in conjunction with said transfer links;

means normally operable upon the existence of any transfer link being inits stored condition for initiating a cycle of operation of said printpower control device;

means operated by said print power control device for placing storedtransfer links into their control condition;

a tabulation mechanism operatively connected to one of said printingmeans and said platen for causing rela-- tive movement thereof to anadvanced line position, said tabulation mechanism comprising a controlmember having a normal inactive position and active: position indicativeof tabulation operation;

a latch operatively associated with said control mem-- ber for retainingsaid control member in its active position when independently movedthereto;

means responsive to the attainment of a predetermined advanced lineposition by said printing means and said platen for moving said latch tounlatch said control member; and

ancillary means cooperative with said cycle initiating means forpreventing cycle initiation thereby at any time said tabulation controlmember is in its active. position.

7. A typewriter as defined in claim 6 further comprising an interkeyinterlock operatively associated with all of said transfer links forpreventing the multiple presence of transfer links in said storagestate.

8. A typewriter having a keyboard, a platen, printing means cooperabletherewith under the control of said keyboard, and means supporting saidplaten and said printing means for relative movement along a writingline, the improved control mechanism comprising:

a transfer link individually associated with each character key of saidkeyboard, each of said transfer links having a normal inactivecondition, a stored condition, and a control condition, each of saidtransfer links when in its control condition being operative to effectprinting of an associated character;

a cyclically operable print power control device for effecting printingoperations in conjunction with said transfer links;

means normally operable upon the existence of any transfer link being inits stored condition for initiating a cycle of operation of said printpower control device;

means operated by said print power control device for placing storedtransfer links into their control condition;

a print position locating mechanism operatively connected to one of saidprinting'means and said platen for causing relative movement thereof arandom distance to a predetermined print position, said mechanismcomprising a control member having a normal inactive position and activeposition indicative of a print position relocating operation;

a latch operatively associated with said control member for retainingsaid control member in its active. position when independently movedthereto;

means responsive to the attainment of said predetermined print positionby said printing means and said platen for moving said latch to unlatchsaid control member; and

ancillary means cooperative with said cycle initiating means forpreventing cycle initiation thereby at any time said control member isin its active position.

(References on following page) 9 10 References Cited 3,086,635 4/1963Palmer 19716 3,157,265 11/1964 Palmer 19716 UNITED STATES PATENTS3,191,740 6/1965 Smusz 197 16 114199172 6/1922 RPSCh 197-176 3,195,7077/1965 Reynard 197-16 1,824,099 9/1931 Plmm 5 3,268,051 8/1966 Krauss eta1. 197-65 2,103,921 12/1937 Thompson 197-17 2,879,876 3/1959 Palmer eta1 197--16 9 3,045,799 7/1962 Seymour etal n 197 107 ROBERT E. PULFREY,Przmaly Examiner.

3,077,971 2/1963 Palmer 197-16 E. S. BURR, Examiner.

1. A TYPEWRITER HAVING A KEYBOARD, A PLATEN, PRINTING MEANS COOPERABLETHEREWITH UNDER THE CONTROL OF SAID KEYBOARD, AND MEANS SUPPORTING SAIDPLATEN AND SAID PRINTING MEANS FOR RELATIVE MOVEMENT ALONG A WRITINGLINE, THE IMPROVED CONTROL MECHANISM COMPRISING: A TRANSFER LINKINDIVIDUALLY ASSOCIATED WITH EACH CHARACTER KEY OF SAID KEYBOARD, EACHOF SAID TRANSFER LINKS HAVING A NORMAL INACTIVE CONDITION, A STOREDCONDITION, AND A CONTROL CONDITION, EACH OF SAID TRANSFER LINKS WHEN INITS CONTROL CONDITION BEING OPERATIVE TO EFFECT PRINTING OF ANASSOCIATED CHARACTER; A CYCLICALLY OPERABLE PRINT POWER CONTROL DEVICEFOR EFFECTING PRINT OPERATION IN CONJUNCTION WITH SAID TRANSFER LINKS;MEANS NORMALLY OPERABLE UPON THE EXISTENCE OF ANY TRANSFER LINK BEING INITS STORED CONDITION FOR INITIATING A CYCLE OF OPERATION OF SAID PRINTPOWER CONTROL DEVICE; MEANS OPERATED BY SAID PRINT POWER CONTROL DEVICEFOR PLACING STORED TRANSFER LINKS INTO THEIR CONTROL CONDITION; A LINERETURN MECHANISM OPERATIVELY CONNECTED TO ONE OF SAID PRINTING MEANS ANDSAID PLATEN CAUSING RELATIVE MOVEMENT THEREOF FROM AN ADVANCED LINEPOSITION TO A NEW LINE POSITION, SAID LINE RETURN MECHANISM COMPRISING ACONTROL MEMBER HAVING A NORMAL INACTIVE POSITION AND AN ACTIVE POSITIONINDICATIVE OF LINE RETURN OPERATION; A LATCH OPERATIVELY ASSOCIATED WITHSAID CONTROL MEMBER FOR RETAINING SAID CONTROL MEMBER IN ITS ACTIVEPOSITION WHEN INDEPENDENTLY MOVED THERETO; MEANS RESPONSIVE TO THEATTAINMENT OF A NEW LINE POSITION BY SAID PRINTING MEANS AND SAID PLATENFOR MOVING SAID LATCH TO UNLATCH SAID CONTROL MEMBER; AND ANCILLARYMEANS COOPERATIVE WITH SAID CYCLE INITIATING MEANS FOR PREVENTING CYCLEINITIATION THEREBY THAT ANY TIME SAID CARRIAGE RETURN CONTROL MEMBER ISIN ITS ACTIVE POSITION.